Peugeot 307 - tailgate won't open/car won't lock

Got a bit of an issue with the Mrs 307 (06-plate hatchback, 1.6S Auto).

Took it out today and the front windscreen washers were not working. Mrs said they have not been working for a few days, I assumed the bottle/tubes would be iced up so when we got to our destination I poured the contents of a recently-boiled kettle into the bottle and after 10-15mins the washers were still not working.

For some reason the Mrs thought it would be a good idea to keep the handbook, containing the list & location of the fuses, in the house - which we were now 30-odd miles away from.

Before I touched ANYTHING else on the car I noticed it wouldn't lock. When I press the keyfob button the car would lock itself and immediately open again. I then noticed the tailgate release handle wouldn't work (it's electronic) AND the rear wiper was no longer working. All had been working 20 minutes previously. The car locks/opens itself too when I use the key in the drivers door lock.

I then managed to locate a 10A fuse under the bonnet that had blown - I replaced this and hey presto the front windscreen washers were working again, so that problem was solved.

I have checked every single other fuse under the bonnet and behind the dash and they all appear to be fine (checked in the dark, with a torch and freezing cold fingers though so can't be 100% certain). I mamaged to open the tailgate from the inside and I checked to see if there was anything obvious in & around the boot but there isn't.

So - over to you guys - any ideas? Pure coincedence that the rear wiper/tailgate release/central locking packed up around the same time as the front washers? Or somehow related?

I'm fairly confident the locking/unlocking is related to the tailgate release not working but where does the rear window wiper fault come in? Also, the rear window washer is not working either.

So the BCM (Body Control Module) thinks that the boot is open. That way it will lock the car but instantly unlock it because it thinks the boot is open. That will also explain why the boot will not open electronically because it thinks that it's already open so won't fire the motor.

Might be something silly like the switch freezing in position, might be something like a new lock mechanism. I've found both to be the reason for similar faults.

Popped my head out the front door half an hour ago and pressed the keyfob button - same as last night. Locks then unlocks itself, so I then go & get myself all wrapped up warm (i.e. out of my pyjamas) and trek out to the hut to get the tools.

Walk out the front door and press the keyfob button again - car locks itself and stays locked.